Mostly! I believe there's been some tampering noticed in various Middle Eastern countries (such as Iran and Syria) as well, and I suspect this warning is targeted at them too.
I guess so. A couple weeks ago I experienced something spooky (like session hijack) in Iran and contacted them...
well this coincides nicely the the confirmation that Stuxnet was state-sponsored. This is Google taking a stand. (Not against the creators of Stuxnet, just in general.)